Update the V8 version for Chromium branch 54.

This is a roll-back to 5.4.500.1. This is the most stable candidate out of the latest Canaries.

If this commit results in failures in Blink please contact the Blink sheriff. They may need to make changes to Blink because of the roll-back.

When in doubt please try to contact the committer and reviewers of this CL before reverting it.

NOTRY because of flaky bots.

CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_precise_blink_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel

TBR=machenbach@chromium.org,littledan@chromium.org,vogelheim@chromium.org
NOTRY=true

Review-Url: https://codereview.chromium.org/2272413002
Cr-Commit-Position: refs/heads/master@{#414416}

DEPS

@@ -40,7 +40,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.
-  'v8_revision': '5b52c69a13ffcd2d6dfe7da118b9c530c26c7fc9',
+  'v8_revision': '5ce282769772d94937eb2cb88eb419a6890c8b2d',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling swarming_client
   # and whatever else without interference from each other.